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Dissimilatory iodate reduction by marine Pseudomonas sp. strain SCT
Seigo Amachi1, Nahito Kawaguchi, Yasuyuki Muramatsu
1Department of Bioresources Chemistry, Chiba University, 648 Matsudo, Matsudo-shi, Chiba 271-8510, Japan. amachi@faculty.chiba-u.jp
Applied and Environmental Microbiology
|July 24, 2007
Summary
A newly isolated marine bacterium, strain SCT, reduces iodate to iodide anaerobically. This bacterial iodate reductase is induced by iodate and located in the periplasmic space, enabling dissimilatory reduction.
Area of Science:
- Microbiology
- Environmental Science
- Biochemistry
Background:
- Bacterial iodate reduction is poorly understood.
- Limited isolates and enzyme information hinder research.
Purpose of the Study:
- Isolate and characterize a novel iodate-reducing bacterium.
- Investigate the key enzymes and conditions for bacterial iodate reduction.
Main Methods:
- Isolation of strain SCT from marine sediment.
- Anaerobic and aerobic culture experiments.
- Enzyme activity assays and subcellular localization.
Main Results:
- Strain SCT, related to Pseudomonas stutzeri, reduces iodate to iodide anaerobically.
- Iodate reduction requires anaerobic conditions and is dependent on prior growth with iodate.
- Methyl viologen-dependent iodate reductase activity was detected, primarily in the periplasm.
- Strain SCT can grow anaerobically using iodate as the sole electron acceptor.
Conclusions:
- Strain SCT is a dissimilatory iodate-reducing bacterium.
- Bacterial iodate reductase is induced by iodate under anaerobic growth.
- The enzyme is periplasmically located and essential for anaerobic respiration with iodate.
